The complaint, lodged in the U.S. District Court for the Northern District of Illinois, alleges that De’Longhi and Saeco make cappuccino machines that feature a removable milk container protected by Conair’s patent.

De’Longhi’s Perfecta and Nespresso line of cappuccino machines and Saeco’s Xelsis and Gaggia Accademia models infringe U.S. Patent Number 5,473,972, issued in December...